en_tn/1sa/29/04.md

do not let him go with us into battle

"do not let his army join with our army against our enemies"

For how else could this fellow make peace with his master? Would it not be with the heads of our men?

This rhetorical question can be translated as a statement. AT: "The best way for David to make peace with his master would be by killing our soldiers!" (See: rc://en/ta/man/translate/figs-rquestion)